10. Case 07: A Bricks Catapult

10.1. Purpose

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Make a bricks catapult with NezhaA Inventor’s Kit.

10.2. Purchse

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NezhaA Inventor’s Kit

10.3. Materials Required

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10.4. Assembly Steps

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10.5. Hardware Connections

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Connect the motor to M1 port and thetwo buttons to J1 port on Nezha-A master box.

10.6. Programming

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10.6.1. Prepare the programming

Steps for preparation please refer to: Arduino 3 in 1 Breakout Board Import the libraries and the subsidiary libraries of Nezha-A master box and then import the libraries of the two buttons: PlanetXButton-main.zip Download and import the self-defined library connections for Nezha-A master box: RJPins-main.zip

10.6.2. Sample Code:

// Language ArduinoC
#include <RJPins.h>
#include <NezhaA.h>
#include <PlanetXButton.h>

PlanetXButton buttonJ1(J1);    //Create an instance of PlanetXButton category
NezhaA nezhaA;    //Create an instance of NezhaA category

void setup() {
  nezhaA.begin();    //Initiliaze the buzzer, motor, servo and light
}

void loop() {
  if (buttonJ1.isPressed(C)) {    //While button C is pressed
    nezhaA.setMotorSpeed(M1, 30);   //Set the speed of the motor connecting to M1 at 50%
    delay((0.5) * 1000);    //Pause 500ms
    nezhaA.brakeMotor(M1);    //Stop the motor connecting to M1
  }
  if (buttonJ1.isPressed(D)) {    //While button D is pressed
    nezhaA.setMotorSpeed(M1, -100);
    delay((0.5) * 1000);
    nezhaA.brakeMotor(M1);
  }
}

10.6.3. Result

After powering on, press button C to lift the pole, then press button D and the bricks would be flapped out by the pole.